WO2018131512A1

WO2018131512A1 - Joining method for members and joint

Info

Publication number: WO2018131512A1
Application number: PCT/JP2017/047274
Authority: WO
Inventors: 康裕前田; 徹橋村; 良平幸重
Original assignee: 株式会社神戸製鋼所
Priority date: 2017-01-12
Filing date: 2017-12-28
Publication date: 2018-07-19
Also published as: CN110139721A; CN110139721B; JP6765310B2; DE112017006800T5; JP2018111115A; US20190374994A1; US11084083B2; DE112017006800B4

Abstract

In a joining method for members, a tube body 20 having a center axis L, a wall surface body 10 having a hole part 11 through which the tube body 20 can be inserted, and an elastic body 40 that can be inserted in the tube body 20 are prepared. The tube body 20 has internal ribs 21 extending in the direction of the center axis L so as to partition the inside thereof, and the internal ribs 21 have notch parts 22 cut from the lower end of the internal ribs 21 in the direction of the center axis L. Next, the tube body 20 is inserted through the hole part 11 in the wall surface body 10, and the elastic body 40 is inserted into the internal spaces partitioned off by the internal ribs 21 of the tube body 20. Furthermore, the elastic body 40 is compressed in the direction of the center axis L of the tube body 20 and made to expand toward the outside in the direction of the diameter of the center axis L, thereby expanding and deforming the end part of the tube body 20 and crimping the same to the wall surface body 10.

Description

Member joining method and joined body

The present disclosure relates to a method for joining members and a joined body.

A low specific gravity and high strength metal called high tension steel is used to reduce the weight and safety of automobiles. High tension steel is effective in reducing weight and improving safety, but is heavier than low specific gravity materials such as aluminum. Further, when high tension steel is used, problems such as a decrease in formability, an increase in forming load, and a decrease in dimensional accuracy occur due to high strength. In order to solve these problems, in recent years, extruded materials, cast products (die-cast products) and press-formed products of aluminum alloys having a specific gravity lower than that of steel are used for vehicle parts. Since this aluminum alloy has a low specific gravity, it is effective in reducing the weight, but its safety is poor because of its low strength. Therefore, it is often used for outer plate parts (press-molded products) or parts (extruded materials / die-cast materials) that require rigidity. The above-described multi-material use of steel parts and aluminum alloy parts at appropriate positions in the vehicle is effective in suppressing an increase in cost associated with weight reduction of the vehicle.

The problem with multi-materials is the joining of dissimilar metals such as steel parts and aluminum parts. For example, Patent Literature 1 and Patent Literature 2 disclose a joining method for members that enables joining of dissimilar metals in multi-materialization by using an elastic body. In detail, in the joining method of these members, a pipe member is inserted into the hole of a plate member, an elastic body is inserted inside the pipe member, and the pipe member is expanded by pressurizing the elastic body. And pipe members are caulked and joined.

JP 51-133170 A JP-A-9-192760

However, in the method for joining members disclosed in Patent Document 1 and Patent Document 2, if the inner rib is provided on the pipe member (tubular body), the inner rib suppresses the expansion of the tube, and thus the joint body is sufficient. It is conceivable that the bonding strength cannot be obtained. In particular, in Patent Document 1 and Patent Document 2, there is no particular suggestion for a decrease in bonding strength caused by such an inner rib.

The embodiment of the present invention has been made under such circumstances, and the purpose thereof is the same as when the inner rib is not provided even when the inner rib is provided in the pipe body. It is providing the joining method of the member which can obtain sufficient joining strength, and the conjugate | zygote which has sufficient joining strength joined by the said method.

The member joining method according to the embodiment of the present invention has a central axis extending in the vertical direction, and an inner rib extending in the central axial direction so as to partition the inside is provided. A tube body provided with a notch cut out in the central axis direction from the lower end of the rib, a wall surface body having a hole portion into which the tube body can be inserted, and an elastic body insertable into the tube body Preparing, inserting the tubular body into the hole of the wall body, inserting the elastic body into an internal space partitioned by the inner rib of the tubular body, and inserting the elastic body into the central axis of the tubular body Compressing in the direction and expanding outward in the radial direction of the central axis, thereby expanding the insertion portion of the tubular body into the wall surface body and caulking and joining to the wall surface body.

According to this method, since the tube can be expanded uniformly by the elastic body, the local load on the tube can be reduced and local deformation can be prevented. Therefore, compared with other joining methods, the tube body and the wall surface body can be fitted with high accuracy, that is, the joining strength can be improved. In addition, the inner rib is provided on the tube from the viewpoint of improving the strength, etc., but since the notch is provided at the lower end of the inner rib, the inner rib is unlikely to become a resistance when expanding the tube, and the tube The tube can be expanded sufficiently. Accordingly, it is possible to secure sufficient joint strength equivalent to that in the case where the inner rib is not provided on the tube body.

The hole portion of the wall surface body may be subjected to burring so that the wall surface of the hole portion rises in the direction of the central axis.

According to this method, since the wall surface of the hole is raised by burring, the joint area between the tube body and the wall surface body is increased. Accordingly, the bonding strength can be improved.

The hole formed by the burring process may have a C surface.

According to this method, since the C surface is provided in the hole, the tube can be expanded further. Specifically, the burring process that provides the C-plane can form a larger hole than a burring process that simply raises the wall surface vertically. Therefore, the tube can be expanded more greatly by the amount of the hole formed larger. Accordingly, the portion to be expanded that serves as a retaining member can be formed large, so that the bonding strength can be improved.

An upper edge of the wall surface of the hole portion raised by the burring process includes a right side portion and a corner portion connecting the right side portion, and the right side portion is raised higher than the corner portion. It may be done.

According to this method, the straight side portion is formed higher than the corner portion. Therefore, the joint area between the tubular body and the wall surface body at the straight side portion can be made larger than the joint area at the corner portion. From the viewpoint of rigidity, the tubular body is difficult to be expanded at the corners and is easily expanded at the straight side. Therefore, it is possible to efficiently improve the bonding strength by increasing the bonding area at the straight side portion that is easily expanded.

The height of the notch may be equal to or higher than the height of the upper edge of the wall surface of the hole raised by the burring process.

According to this method, since the height of the notch is equal to or higher than the height of the upper edge of the wall surface of the hole (burring height), the lower end (insertion portion) of the tube can be greatly expanded at the height of the burring. . Therefore, the tubular body can be expanded and caulked and joined to the entire burringed hole, so that the joining strength can be improved. Here, the burring height refers to the height of the upper edge of the hole raised by burring.

The notch portion may be provided in a connection portion between the inner rib and the inner surface of the tubular body.

According to this method, the notch portion is provided in the connecting portion, that is, the inner rib and the inner surface of the tubular body are partially separated at the connecting portion, so that the inner rib is against the expansion of the tubular body. It is possible to efficiently suppress resistance. Therefore, the amount of tube expansion can be increased, and the bonding strength can be improved.

A joined body according to an embodiment of the present invention includes a tubular body having a central axis extending in the vertical direction and a wall surface body having a hole portion through which the tubular body can be inserted, and the insertion portion of the tubular body is expanded. The inner wall is caulked and joined to the wall surface body, and an inner rib extending in the central axis direction is provided in the insertion portion of the tube body so as to partition the inside, and the inner rib is provided with the inner rib. A notch is formed by notching from the lower end in the direction of the central axis.

According to this configuration, even if the inner rib is provided in the joined body as described above, the notch portion is provided in the inner rib. Therefore, the joined body is sufficient as long as the inner rib is not provided. Bonding strength can be obtained.

According to the embodiment of the present invention, even if the inner rib is provided in the tubular body in the joined body, since the inner rib is provided with the cutout portion, it is sufficient as much as the case where the inner rib is not provided. Can obtain a high bonding strength.

The perspective view from the upper part of the joined body joined by the joining method of the member concerning the embodiment of the present invention. The perspective view from the downward direction of the conjugate | zygote of the conjugate | zygote of FIG. The 1st process drawing of the joining method of the member concerning an embodiment. The 2nd process drawing of the joining method of the member concerning an embodiment. The 3rd process drawing of the joining method of the member concerning an embodiment. The 4th process drawing of the joining method of the member concerning an embodiment. The 5th process drawing of the joining method of the member concerning an embodiment. The 6th process drawing of the joining method of the member concerning an embodiment. The 7th process drawing of the joining method of the member concerning an embodiment. The perspective view which shows the comparative example of the conjugate | zygote of FIG. The bottom view which shows the modification of a tubular body. The bottom view which shows the other modification of a tubular body. The bottom view which shows the other modification of a tubular body.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the member joining method of the present embodiment is a method of joining the wall surface body 10 and the tube body 20 to form the joined body 1. In this member joining method, the insertion portion of the tube body 20 into the wall surface body 10 expands radially outward of the central axis L, the tube body 20 is caulked and joined to the hole 11 of the wall surface body 10, and the joined body 1 is It is formed.

The wall surface body 10 is a plate member having a hole portion 11 that is substantially rectangular in a plan view (viewed from the direction of the central axis L). The inner shape of the hole 11 is preferably similar to the outer shape of the tubular body 20 in plan view, and is preferably as small as possible within a range in which the tubular body 20 can be inserted. Moreover, the hole 11 is burring processed, that is, the wall surface of the hole 11 is raised in the central axis L direction (upward). In particular, by this burring process, the straight side portion 13 of the edge portion (upper end edge) 12 of the hole portion 11 is raised higher than the corner portion 14. Such a wall surface body 10 is a metal member made of, for example, high tension steel or aluminum alloy, and may be a part of a mounting plate of a bumper system that is mounted on an automobile.

The tubular body 20 extends in the central axis L direction (vertical direction), and the cross-sectional shape orthogonal to the central axis L is generally rectangular. A cross-shaped inner rib 21 is provided inside the tube body 20 when viewed from the direction of the central axis L, and the inner space of the tube body 20 is divided into four by the inner rib 21. As shown in FIG. 2, the inner rib 21 extends from the upper end to the lower end of the tubular body 20, and has a notch 22 that is notched in the central axis L direction at the lower end. The notch portion 22 is provided in the inner rib 21 at a connection portion with the inner surface of the tubular body 20. In the present embodiment, since there are four connection portions, four cutout portions 22 are provided in accordance with the positions. The depth (height) D of the notch 22 is preferably equal to or higher than the rising height (hereinafter referred to as burring height) of the edge 12 of the hole 11 of the wall surface body 10 as will be described later. The width W of the notch 22 is preferably small, but may be the entire inner width of the tubular body 20 at the maximum. In other words, the state in which the cutout portion 22 of the entire inner width of the tube body 20 is provided refers to a state in which the inner rib 21 has been completely removed from the end portion to the depth D. Such a state has an advantage that the peak load when the joined body 1 receives an external force can be reduced. Such a tubular body 20 is, for example, an extruded material made of an aluminum alloy, and may be a part of a stay of a bumper system attached to an automobile.

Referring to FIGS. 3A to 3G, the method for joining members of the present embodiment for forming the joined body 1 as shown in FIGS. 1 and 2 will be described by dividing it from the first step to the seventh step.

As shown in FIG. 3A, in the first step, the wall surface body 10, the tube body 20, and the elastic body 40 placed on the mounting table 30 are prepared. The upper surface of the mounting table 30 is flat, and a counterbore 31 is provided at the center of the upper surface. The counterbore 31 is similar to the outer shape of the tube body 20 in plan view, and is formed slightly smaller than the outer shape of the tube body 20. Moreover, the C surface 15 is formed in the hole 11 by the burring process mentioned above. The formation angle of the C-plane 15 is generally 45 degrees and is illustrated as 45 degrees in this embodiment as well, but the formation angle may be arbitrary. As described above, the tubular body 20 is provided with the notches 22 (see FIGS. 1 and 2) in the inner rib 21, but the inner rib 21 is not illustrated because FIG. 3A is a cross-sectional view. The elastic body 40 is made of an elastic material, for example, urethane rubber, chloroprene rubber, CNR rubber (chloroprene rubber + nitrile rubber), or silicon rubber. Four elastic bodies 40 are prepared corresponding to the number of internal spaces of the partitioned pipe body 20. Each elastic body 40 has a cylindrical shape with a size that can be inserted into the tube body 20, and has a through-hole 41 extending in the longitudinal direction at the center.

As shown in FIG. 3B, in the second step, the tube body 20 is inserted into the hole 11 of the wall surface body 10 and mounted on the mounting table 30. At this time, the tube body 20 does not enter the counterbore 31 of the mounting table 30 and is mounted on the upper surface of the mounting table 30. Further, the height D of the notched portion 22 illustrated virtually is slightly higher than the burring height H of the hole 11 of the wall surface body 10.

As shown in FIG. 3C, in the third step, the wall surface body 10 is pressed and fixed to the mounting table 30 by the pad 50. The pad 50 has a substantially rectangular tube shape similar to the outer shape of the tubular body 20 in a plan view, and has a flange portion 51 for pressing the wall surface body 10 at the lower end. The pad 50 is mechanically connected to a pressing device (not shown) or the like, and can be moved up and down with a predetermined force enough to press and fix the wall surface body 10 toward the mounting table 30.

3D, in the fourth step, the elastic body 40 sandwiched between the pressurizing tools 60 is inserted into the tube body 20. The pressurizing tool 60 includes an upper tool 61, a lower tool 62, and a spring 63. The upper tool 61 includes a columnar upper head 61a and four cylindrical receivers 61b extending downward from the upper head 61a. The lower tool 62 includes four lower heads 62 a sized to be inserted into the tube body 20 and rods 62 b extending upward from the respective lower heads 62 a, and the lower heads 62 a are counterbore holes 31 of the mounting table 30. Is placed inside. The rod 62b is inserted into the receiver 61b in a state of passing through the through hole 41 of the elastic body 40. A spring 63 is disposed between the upper surface of the rod 62b and the lower surface of the upper head 61a, and the upper tool 61 and the lower tool 62 are urged away from each other by the spring 63. 3D is a cross-sectional view, two of the four receivers 61b are illustrated, and similarly, two of the four rods 62b are illustrated. Further, the fourth step may be performed before the second step. That is, the tube body 20 with the pressurizing tool 60 inserted may be placed on the placing table 30.

As shown in FIG. 3E, in the fifth step, the upper head 61a of the upper tool 61 is pressed downward against the urging force of the spring 63, and the elastic body 40 is centered on the tube body 20 via the pressurizing tool 60. It compresses in the direction of the axis L and expands outward in the radial direction of the central axis L, thereby enlarging and deforming the end of the tube body 20 and caulking and joining to the wall surface body 10. At this time, the tube body 20 is deformed along the C surface 15 of the hole portion 11 of the wall surface body 10 and the upper portion of the hole portion 11 of the wall surface body 10 is partially expanded. When the pressing force applied to the upper head 61a is removed after the pipe body 20 is expanded, the pressurizing tool 60 and the elastic body 40 are restored to their original shapes (FIG. 3D) by the urging force of the spring 63 and its own elastic force. .

As shown in FIG. 3F, in the sixth step, the pressurizing tool 60 and the elastic body 40 restored to the original shape (FIG. 3D) are taken out from the tube body 20. Since the tubular body 20 is plastically deformed even after being taken out, the expanded shape is maintained, and the caulking joint applied in the fifth step is not released.

As shown in FIG. 3G, in the seventh step, the pressing force applied to the pad 50 is released and the pad 50 is removed. Thus, the joined body 1 in which the tubular body 20 and the wall surface body 10 are joined is obtained.

The bonded body 1 obtained as described above has the following effects.

According to the present embodiment, since the tubular body 20 can be expanded uniformly by the elastic body 40, a local load on the tubular body 20 can be reduced and local deformation can be prevented. Therefore, compared with other joining methods, the pipe body 20 and the wall surface body 10 can be fitted with high accuracy, that is, the joining strength can be improved. In addition, the tube body 20 is provided with an inner rib 21 from the viewpoint of improving the strength, etc., but since the notch 22 is provided at the lower end of the inner rib 21, the inner rib 21 has a resistance when expanding the tube. Therefore, the insertion portion of the tubular body 20 can be expanded sufficiently. Accordingly, it is possible to ensure sufficient joint strength equivalent to that in the case where the inner rib 21 is not provided on the tube body 20.

As shown in FIG. 4, when the inner rib 21 is not provided with the notch 22, the inner rib 21 expands the tubular body 20 even if the caulking joining using the elastic body 40 is performed. Therefore, the tubular body 20 is not sufficiently expanded. On the other hand, in this embodiment, as shown in FIG. 2, by providing the inner rib 21 on the tube body 20, resistance to the tube expansion can be suppressed and the tube body 20 can be sufficiently expanded.

Moreover, since the wall surface of the hole 11 of the wall surface body 10 is raised by burring, the bonding area between the tube body 20 and the wall surface body 10 is increased, and the bonding strength is improved.

Moreover, since the C surface 15 (refer FIG. 3A) is provided in the hole part 11, the tubular body 20 can be expanded more greatly. Specifically, the burring process for providing the C surface 15 can form the hole 11 larger than, for example, a burring process that simply stands up vertically. Therefore, the tube body 20 can be expanded further by the amount that the hole 11 is formed larger. Accordingly, the portion to be expanded that serves as a retaining member can be formed large, so that the bonding strength can be improved.

Further, the straight side 13 is formed higher than the corner 14 at the edge 12 of the hole 11 (see FIG. 1). Therefore, the joint area between the tubular body 20 and the wall surface body 10 in the straight side portion 13 can be made larger than the joint area in the corner portion 14. From the viewpoint of rigidity, the tubular body 20 is difficult to be expanded at the corner portion 14 and is easily expanded at the straight side portion 13. Therefore, it is possible to efficiently improve the bonding strength by increasing the bonding area in the straight side portion 13 that is easily expanded.

Moreover, since the height D of the notch 22 is equal to or higher than the burring height H of the hole 11 (see FIG. 3B), the lower end portion (insertion portion) of the tubular body 20 can be greatly expanded at this burring height. Therefore, since the tubular body 20 can be expanded and caulked and joined to the entire hole 11 subjected to burring, the joining strength can be improved.

Further, the notch 22 is provided in the inner rib 21 at the connection portion with the inner surface of the tube body 20, that is, the inner rib 21 and the inner surface of the tube body 20 are partially separated at the connection portion. Thus, it is possible to efficiently suppress the inner rib 21 from becoming a resistance to the expansion of the tubular body 20. Therefore, the amount of pipe expansion of the tubular body 20 can be increased, and the bonding strength can be improved.

The aspect of each member used in this embodiment can be various. As described above, in this embodiment, the bonded body 1 is formed using the mounting table 30 and the pressurizing tool 60. However, the mounting table 30 and the pressurizing tool 60 may not be used. Further, the hole 11 of the wall surface body 10 does not have to be burring processed, and the tube body 20 can be directly caulked and joined to the edge of the hole 11. Moreover, the aspect of a burring process is not specifically limited, For example, R surface processing may be sufficient besides the C surface processing of this embodiment. Moreover, the inner rib 21 of the tube body 20 is not specifically limited, It can also be aspects other than a cross shape.

As shown in FIG. 5, as a modification of the present embodiment, the position of the notch 22 may be the center of the cross-shaped inner rib 21. Thereby, the place which provides the notch part 22 can be made into one place.

As shown in FIGS. 6A and 6B, as another modification of the present embodiment, the cross-sectional shape of the tubular body 20 may be, for example, a circle. Even in the case of a circular shape, the position of the cutout portion 22 provided in the inner rib 21 may be a connection portion with the inner surface of the tube body 20 (see FIG. 6A) or a central portion of the inner rib 21 (see FIG. 6B). As shown in this modification, the shape of the tubular body 20 and the position of the inner rib 21 are not particularly limited, and may be in any form.

As described above, specific embodiments of the present invention and modifications thereof have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content of each embodiment is good also as one Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Joining body 10 Wall surface body 11 Hole part 12 Edge part 13 Direct side part 14 Corner | angular part 15 C surface 20 Tubing body 21 Inner rib 22 Notch part 30 Mounting base 31 Counterbore 40 Elastic body 41 Through-hole 50 Pad 51 Flange part 60 Pressurizing tool 61 Upper tool 61a Upper head 61b Receiver 62 Lower tool 62a Lower head 62b Rod 63 Spring

Claims

An inner rib having a central axis extending in the vertical direction and extending in the central axial direction so as to partition the inside is provided, and the inner rib is notched in the central axial direction from the lower end of the inner rib Preparing a tube body provided with a notch, a wall surface body having a hole portion into which the tube body can be inserted, and an elastic body insertable into the tube body;
Inserting the tubular body into the hole of the wall surface body;
Inserting the elastic body into the internal space partitioned by the inner rib of the tubular body;
The elastic body is compressed in the direction of the central axis of the tubular body and expanded outward in the radial direction of the central axis, thereby expanding the insertion portion of the tubular body into the wall surface body to form the wall surface body. A method for joining members, including caulking and joining.
The method for joining members according to claim 1, wherein the hole portion of the wall body is subjected to burring so that the wall surface of the hole portion rises in the central axis direction.
The method for joining members according to claim 2, wherein the hole raised by the burring process has a C-plane.
The upper end edge of the wall surface of the hole portion raised by the burring process includes a straight side portion and a corner portion connecting the straight side portion,
The method for joining members according to claim 2, wherein the right side portion is raised higher than the corner portion.
The member joining method according to claim 2 or 3, wherein a height of the notch is equal to or higher than a height of an upper edge of the wall surface of the hole raised by the burring process.
The method for joining members according to any one of claims 1 to 3, wherein the notch is provided in a connection portion between the inner rib and the inner surface of the tubular body.
A tube having a central axis extending in the vertical direction;
A wall surface having a hole through which the tubular body can be inserted,
It is caulked and joined to the wall surface in a state where the insertion portion of the tubular body is expanded,
An inner rib extending in the central axis direction so as to partition the inside is provided in the insertion portion of the tubular body, and the inner rib has a notch cut out in the central axis direction from the lower end of the inner rib. A joined body in which a portion is provided.